Bluetooth speaker wireless subwoofer wifi speaker series philips izzy power rating 5 watt speaker system 20 stereo principle active frequency response 100 16000 hz sensitivity 81 dbmw noise level 62 db impedance 4 ohm power supply mains operation colour white function streaming controllable via buttons knob control features onoff volume control bluetooth pairing speaker enclosure bass reflex number of full range drivers 2 full range chas